Orange Rili Dwarf Shrimp (Neocaridina davidi var. 'Orange Rili'): Care Guide and Origins

The Orange Rili Dwarf Shrimp is a beautiful and unique color variation of Neocaridina davidi, known for its distinctive translucent and bright orange coloration. These shrimp are prized in the aquarium hobby for their striking appearance and ease of care, making them a popular choice for aquarists of all skill levels.

Origins and Natural Habitat

The Orange Rili Dwarf Shrimp is a selectively bred variety of the Neocaridina davidi, which is native to the freshwater streams and rivers of Taiwan and China. In the wild, the natural form of this species is far more subdued, with a mostly transparent or brownish coloration. Selective breeding has led to the development of many color variations, with the Orange Rili shrimp standing out for its vibrant mix of orange and translucent sections.

In their natural habitat, these shrimp are found in areas with plenty of plant cover and soft, slow-moving water. In captivity, replicating these conditions will help them thrive and exhibit their best coloration.

Aquarium Setup and Care

1. Tank Size
   Orange Rili Dwarf Shrimp are small, growing up to 1–1.5 inches (2.5–4 cm), and can comfortably live in a 5-gallon (19-liter) tank. A larger tank, however, provides greater water stability and more room for them to explore. For colonies, a tank size of 10 gallons (38 liters) or more is recommended.
2. Water Parameters
   Like other dwarf shrimp, Orange Rili Shrimp require stable and clean water conditions to thrive. Here are the ideal water parameters:
   • Temperature: 65–80°F (18–27°C)
   • pH: 6.5–7.5
   • Water Hardness: GH 4-8, KH 1-4
   • Ammonia & Nitrite: 0 ppm (toxic to shrimp)
   • Nitrate: Below 20 ppm

   To maintain these water conditions, it's important to conduct regular water changes of 10-20% per week and use a sponge filter or a shrimp-safe filter to avoid injuring the shrimp with strong suction.

3. Substrate and Plants
   The natural beauty of the Orange Rili Shrimp shines in a well-planted tank. Using a dark substrate enhances their colors, while plants provide hiding spaces and surfaces for biofilm to grow, which the shrimp will graze on. Popular plant choices include:
   • Java Moss
   • Anubias Nana
   • Dwarf Sagittaria
   • Cryptocoryne species

   Driftwood and natural rocks can also provide surfaces for biofilm to grow, adding more grazing areas for your shrimp.

4. Tank Mates
   Orange Rili Shrimp are peaceful and should be kept with equally peaceful tank mates. Avoid larger fish or aggressive species that may prey on them. Suitable tank mates include:
   • Small, peaceful fish like Ember Tetras or Chili Rasboras
   • Other dwarf shrimp species (if you wish to mix shrimp, ensure they are of a similar size and temperament)
   • Snails like Nerite or Mystery Snails

   Many shrimp keepers prefer keeping Orange Rili Shrimp in species-only tanks to maximize their breeding potential and reduce the risk of predation.

5. Diet
   Orange Rili Shrimp are scavengers and will consume a wide variety of food sources within the aquarium, including algae, detritus, and biofilm. However, to ensure their nutritional needs are met, it’s a good idea to supplement their diet with:
   • Algae wafers
   • Blanched vegetables (spinach, zucchini, and cucumber)
   • Specialized shrimp pellets
   • Decaying plant matter and biofilm growing on decorations and plants

   Be cautious not to overfeed, as excess food can lead to water quality issues, which are harmful to shrimp.

Breeding Orange Rili Dwarf Shrimp

Orange Rili Dwarf Shrimp are relatively easy to breed in the right conditions, and they will often reproduce on their own in a well-maintained tank. Here are some tips for successful breeding:

• Females can be distinguished by their slightly larger size and the presence of a saddle (a patch of eggs developing inside them). They will carry the fertilized eggs under their swimmerets for about 3-4 weeks.
• After hatching, the baby shrimp (shrimplets) are fully developed but very small. Ensure there is enough biofilm and microalgae in the tank for them to feed on, as they are too small for larger food particles.

If you want to maximize breeding success, avoid having predatory fish in the tank and provide plenty of hiding spots for the shrimplets to grow safely.

The Orange Rili Dwarf Shrimp is a delightful and low-maintenance species that brings vibrant color and activity to any freshwater aquarium. With their peaceful nature and ability to adapt to a range of water conditions, they are perfect for both beginner and seasoned aquarists. By maintaining stable water parameters and a balanced diet, you can enjoy watching these beautiful shrimp thrive and reproduce, adding a dynamic, colorful touch to your aquarium.